Ressurect move.cpp

Actually it is san.cpp renamed. Because now has the move
conversions functions and doesn't have any more the bulky
move_from_san(), it is better to call it move.cpp

Remove san.h while there.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>

src/uci.cpp

@@ -33,7 +33,6 @@
 #include "move.h"
 #include "movegen.h"
 #include "position.h"
-#include "san.h"
 #include "search.h"
 #include "ucioption.h"